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Tube Database (7,341 tube types · 1,270 archive entries)

Other (3,257 tube types), Pre (2,314 tube types), Power (1,030 tube types), Rectifier (740 tube types)
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Tube-number record

FTL 3-1

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BrandBrown Boveri
ClassAir-Cooled Power Triode

Construction

Primary TypeTriode
EnvelopeGlass/Metal
SectionsSingle

Filament / Heater

MaterialThoriated tungsten

Absolute Maximum Ratings

Plate Voltage7000 V
Plate Dissipation3500 W
Grid 1 Voltage-1000 V
Cathode Current1750 mA

Audio Performance

Key Features
  • Directly heated
  • Forced air cooling
  • Industrial and communication applications

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Class C RF, unmodulated5000 V12000—201750 mA
Class B AF Power Amplifier (2 tubes)5000 V——203000 mA

Application Notes

Class C RF amplifier, oscillator for industrial use, Class B AF power amplifier and modulator.

Filters

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